Portion of a work machine



FIG. 1 is a top, front, left perspective view of a portion of a work machine embodying our new design;

FIG. 2 is a left side elevational view thereof; and,

FIG. 3 is a right side elevational view thereof.

The broken line representations in the figures show unclaimed environment or boundaries, and thus form no part of the claimed design. 

CLAIM The ornamental design for a portion of a work machine, as shown and described. 